emergency care or treatment of the injuries or illnesses of a person to stabilize his or her condition before medical help is available.

Merriam-Webster Online Dictionary
first aid (noun)
emergency care or treatment given to an ill or injured person before regular medical aid can be obtained
first aid (Wikipedia)

First aid is the first and immediate assistance given to any person with either a minor or serious illness or injury, with care provided to preserve life, prevent the condition from worsening, or to promote recovery until medical services arrive. First aid is generally performed by someone with basic medical training. Mental health first aid is an extension of the concept of first aid to cover mental health, while psychological first aid is used as early treatment of people who are at risk for developing PTSD. Conflict First Aid, focused on preservation and recovery of an individual's social or relationship well-being, is being piloted in Canada.

The universal first aid symbol
A US Navy corpsman gives first aid to an injured Iraqi citizen.

There are many situations that may require first aid, and many countries have legislation, regulation, or guidance, which specifies a minimum level of first aid provision in certain circumstances. This can include specific training or equipment to be available in the workplace (such as an automated external defibrillator), the provision of specialist first aid cover at public gatherings, or mandatory first aid training within schools. Generally, five steps are associated with first aid:

  1. Assess the surrounding areas.
  2. Move to a safe surrounding (if not already; for example, road accidents are unsafe to be dealt with on roads).
  3. Call for help (both professional medical help and people nearby who might help in first aid such as giving compression during CPR).
  4. Perform suitable first aid depending on the injury suffered by the casualty.
  5. Evaluate the casualty for any fatal signs or danger, or possibility of performing the first aid again.
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